Mich. Comp. Laws § 691.1542a

Sec. 2a. (1) A sport shooting range that is operated and is not in violation of existing law at the time of the enactment of an ordinance shall be permitted to continue in operation even if the operation of the sport shooting range at a later date does not conform to the new ordinance or an amendment to an existing ordinance. (2) A sport shooting range that is in existence as of the effective date of this section and operates in compliance with generally accepted operation practices, even if not in compliance with an ordinance of a local unit of government, shall be permitted to do all of the following within its preexisting geographic boundaries if in compliance with generally accepted operation practices: (a) Repair, remodel, or reinforce any conforming or nonconforming building or structure as may be necessary in the interest of public safety or to secure the continued use of the building or structure. (b) Reconstruct, repair, restore, or resume the use of a nonconforming building damaged by fire, collapse, explosion, act of god, or act of war occurring after the effective date of this section. The reconstruction, repair, or restoration shall be completed within 1 year following the date of the damage or settlement of any property damage claim. If reconstruction, repair, or restoration is not completed within 1 year, continuation of the nonconforming use may be terminated in the discretion of the local unit of government. (c) Do anything authorized under generally accepted operation practices, including, but not limited to: (i) Expand or increase its membership or opportunities for public participation. (ii) Expand or increase events and activities.